code: def symmetric_mse_loss(input1, input2):
      return torch.sum((input1 - input2) ** 2)
  
file_path: KD_Lib/KD_Lib/KD/vision/mean_teacher/mean_teacher.py
imports: import torch
  import torch.nn.functional
  from torch import nn
  from KD_Lib.KD.common import BaseClass
label_desc: Use image node_id 1 for calling a global function with example usage: symmetric_mse_loss(input1, input2) and returns: torch